TY - JOUR
T1 - Preparation of High-Percentage 1T-Phase Transition Metal Dichalcogenide Nanodots for Electrochemical Hydrogen Evolution
AU - Tan, Chaoliang
AU - Luo, Zhimin
AU - Chaturvedi, Apoorva
AU - Cai, Yongqing
AU - Du, Yonghua
AU - Gong, Yue
AU - Huang, Ying
AU - Lai, Zhuangchai
AU - Zhang, Xiao
AU - Zheng, Lirong
AU - Qi, Xiaoying
AU - Goh, Min Hao
AU - Wang, Jie
AU - Han, Shikui
AU - Wu, Xue Jun
AU - Gu, Lin
AU - Kloc, Christian
AU - Zhang, Hua
N1 - Funding Information:
C.T., Z.L., and A.C. contributed equally to this work. This work was supported by Ministry of Education (MOE) under AcRF Tier 2 (ARC 19/15, No. MOE2014-T2-2-093, MOE2015-T2-2-057, MOE2016-T2-2-103, and MOE2017-T2-1-162) and AcRF Tier 1 (2016-T1-001-147, 2016-T1-002-051, and 2017-T1-001-150) and Nanyang Technological University (NTU) under Start-Up Grant (M4081296.070.500000) in Singapore. The authors would like to acknowledge the Facility for Analysis, Characterization, Testing and Simulation, Nanyang Technological University, Singapore, for use of their electron microscopy facilities. The authors also thank the 1W1B beamline of Beijing Synchroton Radiation Facility for supporting this project.
Publisher Copyright:
© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2018/3/1
Y1 - 2018/3/1
N2 - Nanostructured transition metal dichalcogenides (TMDs) are proven to be efficient and robust earth-abundant electrocatalysts to potentially replace precious platinum-based catalysts for the hydrogen evolution reaction (HER). However, the catalytic efficiency of reported TMD catalysts is still limited by their low-density active sites, low conductivity, and/or uncleaned surface. Herein, a general and facile method is reported for high-yield, large-scale production of water-dispersed, ultrasmall-sized, high-percentage 1T-phase, single-layer TMD nanodots with high-density active edge sites and clean surface, including MoS2, WS2, MoSe2, Mo0.5W0.5S2, and MoSSe, which exhibit much enhanced electrochemical HER performances as compared to their corresponding nanosheets. Impressively, the obtained MoSSe nanodots achieve a low overpotential of −140 mV at current density of 10 mA cm−2, a Tafel slope of 40 mV dec−1, and excellent long-term durability. The experimental and theoretical results suggest that the excellent catalytic activity of MoSSe nanodots is attributed to the high-density active edge sites, high-percentage metallic 1T phase, alloying effect and basal-plane Se-vacancy. This work provides a universal and effective way toward the synthesis of TMD nanostructures with abundant active sites for electrocatalysis, which can also be used for other applications such as batteries, sensors, and bioimaging.
AB - Nanostructured transition metal dichalcogenides (TMDs) are proven to be efficient and robust earth-abundant electrocatalysts to potentially replace precious platinum-based catalysts for the hydrogen evolution reaction (HER). However, the catalytic efficiency of reported TMD catalysts is still limited by their low-density active sites, low conductivity, and/or uncleaned surface. Herein, a general and facile method is reported for high-yield, large-scale production of water-dispersed, ultrasmall-sized, high-percentage 1T-phase, single-layer TMD nanodots with high-density active edge sites and clean surface, including MoS2, WS2, MoSe2, Mo0.5W0.5S2, and MoSSe, which exhibit much enhanced electrochemical HER performances as compared to their corresponding nanosheets. Impressively, the obtained MoSSe nanodots achieve a low overpotential of −140 mV at current density of 10 mA cm−2, a Tafel slope of 40 mV dec−1, and excellent long-term durability. The experimental and theoretical results suggest that the excellent catalytic activity of MoSSe nanodots is attributed to the high-density active edge sites, high-percentage metallic 1T phase, alloying effect and basal-plane Se-vacancy. This work provides a universal and effective way toward the synthesis of TMD nanostructures with abundant active sites for electrocatalysis, which can also be used for other applications such as batteries, sensors, and bioimaging.
KW - hydrogen evolution
KW - metallic 1T phase
KW - MoS MoSSe
KW - nanodots
KW - transition metal dichalcogenides
UR - http://www.scopus.com/inward/record.url?scp=85040695325&partnerID=8YFLogxK
U2 - 10.1002/adma.201705509
DO - 10.1002/adma.201705509
M3 - Journal article
C2 - 29333655
AN - SCOPUS:85040695325
SN - 0935-9648
VL - 30
JO - Advanced Materials
JF - Advanced Materials
IS - 9
M1 - 1705509
ER -